The catalytic performance of some metal oxide in the selective oxidation of H₂S in the stream containing water vapor and ammonia was investigated in this study. Among the catalysts tested, Co₃O₄/SiO₂ was the most promising catalyst for practical application. It showed very small amount of SO₂ emission even in the presence of excess water and ammonia. The solid product formed in the reaction was a mixture of elemental sulfur, ammonium thiosulfate and ammonium sulfate.